Eeake-shoe mold



Feb. 19, 1924.

J. s. THOMPSON BRAKE ,SHOE MOLD Filed Aug. 1, 192.5

/r f 2,6/7@ S Patented Feb. 19, 1924.

PATENT OFFICE.

JAMES S. THOMPSON, 0F PELHAM, NEW YORK.

BRAKE-SHOE MOLD.

Application filed August 1, 1923. Serial No`. 655,064.

To all whom t may concern.'

Be it known that l, JAMns S. THOMPSON, a citizen of the UnitedStates,residing at Pelham, inthe county of Westchester and State of NewYork, have invented certain Inew and useful Improvements in Brake-ShoeMolds, of which the following is a specilication.

This invention relates to the manufacture of brake shoes and moreparticularly to the mold in which the brake shoe is cast, and its objectis broadly to enable a brake shoe to be cast in a permanent mold as wellas it can be cast in a sand mold with a saving cf time and a reductionin cost.

A further object of my invention is to provide a permanent mold of thecharacter described having improved means for permitting the gases toescape from the mold cavity during the casting operation.

A still further object of my invention is to provide improved means forsupporting or securing in place in the mold cavity the parts which areto be embedded in the shoe casting.

Other objects of my invention will become apparent as the vdetaildescription progresses, reference being had to the accompanying drawingshowing a selected embodiment of the invention and in which- Fig. 1 is acentral longitudinal section through apermanent mold embodying theYnovel features of my invention, the mold being adapted toproduce a brakeshoe `of lapproved type with an integral composite wearing face.

Fig. 2 is a transverse section taken on line 2-2 of Fig. 1, and l Fig. 3is a central longitudinal section through a permanent mold embodying thenovel features of my invention but being adapted to produce brake shoesof substantially uniform texture.

The mold shown in Figs. '1 and 2 comprises a drag l() and a cope 11having a pouringgate 12 at one end. The mold cavity 13 is formed partlyin the drag and partly in the cope and it has a top wall 111, a bottomwall 1 5, end walls 16 and 17 and side walls 18 and 19. A refractorysection 2O is seated snugly in the bottom wall of the mold cavity andrefractory sections 21 are seated in the top wall of the mold cavity toprevent the metal of the mold from having a chilling efect upon thecasting at the places where these refractory sections constitutewallsurfaces of the mold cavity. The refractory section 20 is of lesslength than the length of themold cavity and end portions of the bottomwall of the mold cavity as well as the end walls 16 and 17 of the moldcavity are left bare, as shown, so that the hot metal of thecasting.will contact directly ywith the metal of the mold to produce a shoehaving Vchilled end portions. rilhis .type of mold is constructed forcasting an approved type of brake shoe withan integral composite wearingface having chilled end portions and an intermediate unchilled portion.

The cope 11 is provided with a recess 22 and an opening 23 which extendsthrough the top of the cope. rfhe side walls of the recess are taperedand the side walls of the opening are substantially straight. A sandplug is adapted to be inserted inthe recess from the inner side of the.cope and it is shaped to fit snugly in the recess. The sand plug isprovided with a recess 29 to form the attaching lug of the brake shoeand this recess is suitably shaped to receive the steel lug 26y and thesand core 28 and to provide for the hot metal to run up about the lugfor embedding itl with .the body of the shoe toform the attaching lug.The

reinforcing back 27 is also engaged with the lug 26 and this back andlug and sand core are held in place against theplug and with thereinforcing back against the top wall of the mold cavity by wires 3()which engage the parts to be embedded in the shoe and pass up throughthe sand plug and are engaged with a cross bar 31 extending `across theopening 23 in the cope. In practice it is convenient to assemble thereinforcing back, the core and the lug with the .sand plug as a unit andthen arrange them in their proper position in the mold, as shown in Fig.1, after which the wires may be engaged with the cross bar 31. The wiresmay be passed through the sand plug before or after the Lunit isinserted in the mold. The sand plug is of suliicient size to permit theattaching lug of the shoe to be cast therein. After the sand plug andits associated parts have been secured in the cope y'the latter may bearranged in operative position on the drag and the mold is then readyfor pouring. The gases produced during the casting operation arepermitted to escape through the sand plug andthe open- While it iscustomary to provide a baked sand core for forming the opening in theattaching lug of the shoe, and While I con-V form texture throughout thebodyV of the shoe. rlhe mold comprises a drag 10a, and a cope 11a. Apouring gate 12et is shown located at one end of the mold and the moldhas a mold cavity 13 formed therein.

.This mold is adapted to produce a shoe of substantially the sameshapeas that produced by the mold shown in Figs. land 2. rihe cope 11ais adapted to receive a steel attaching lug 26, a steel reinforcing back27 and a sand core 28, these parts being identical With the similarlydesignated parts of Figs. 1 and 2. rlhe mold shown in F ig. 3 is alsoprovided/with a porous plug 211 seated ina recess 22 formed in the cope11, the porous plugv2f1- being identical With the porous plug 24 ofVFigs. 1 and 2. And Wire loops 30 suspended from a bar 81 are alsoemployed in the mold of Fig. 3 to securethe reinforcing unit and theporous plug 24; in their proper positions in the cope member 11a.However, the mold of Fig. 3 differs from the mold 0f Figs. 1 and 2 inthat the Walls of the mold cavity vlL are formed entirely of refractorysections forming parts of the mold, together With the porous plug 211invvhich the attaching lug is formed. rlhe cope member 10a is providedWith a-refractory section 2Oa Which forms the bottom Wall 15a the endWall 17, and the side Walls 18a and 19 (not shovvn) of the mold cavity13a.

The cope member 11a is provided With refractory sections 21a and 21h.The refractory section 21a forms a portion of the top Wall 141-a of themold cavity 13a, and the refractory section 21"y forms another portionof the top Wall 14a and also forms the end Wall 16il of the cavity.rlhis construction prevents the hot metal from com- VingY into contactWith the metal of the mold and the brake shoe produced in the mold is ofsubstantially-uniform texture.

My invention can be employed for making castings other than brake shoesand I consider myself entitled to make all such chang'esin the form,construction and arrangementnof parts as may vbe necessaryv or desirablefor this purpose and for making ing a mold cavity therein, said copehavingV a recess communicating with the inold cavity and having anopening communicating with said recess, a porous alug seated in sairecess, and means exten ing through said 4porous plug and through saidopening for securing in place in the mold cavity the partsto be embeddedin the casting.

2. A permanent mold for making Vcastings, and comprisinga drag and acope havmold cavity therein, said cope having a recess con'imunicatingwith the mold cavity and having an opening communicatin with said recss, a porous plug seated in sai recess, and Wires embedded in the porousplug for securing in place in the cavity the parts to be embedded in thecasting.

8. A periminent mold for making castings, and comprising a drag and acope having a mold. cavity therein, said cope having a recesscommunicating with the mold cavity and having an opening communicatingWith said recess, a porous plug seated in said recess, and meansextending through the porons plug for securing in place in thev cavitythe parts to be embedded in the casting.

a. fr permanent mold for making castings, and comprising a drag and acope having a mold cavity therein, said cope having a recesscommunicating With the mold cavity and having an opening communicatingIwith said recess, a porous plug seated in said recess, and means forsecuring in proper positionsthe porous plug and the parts to be embeddedin the casting.

5. A permanent mold for making castings, and comprising a drag and acope having a mold cavity therein, said cope having a recesscommunicating with the mold cavity and having an opening communicatin O"with said recess, a porous plug seated in said f said porous plug forsecuring in the cavity the parts to be embedded in the casting, saidsupporting` means comprisingv a looped Wire having its legs extending'through said porous plug, and a transverse supporting bar engaging theouter end of the loop. Y

l?. A. permanent mold for making castllt) ings, and comprising a dragand a, cope having a model cavity therein, said cope having a recesscommunicating with the mold cavity, a porous plug adapted t0 be insertedin said recess from the inner side of the cope and to be seated in saidrecess and means extending through said porous plug for securing inplace in the cavity the parts to be embedded in the cast-ing.

8. A permanent mold for making castings, and comprising a drag and acope having a mold cavity therein, said cope having a recesscommunicating with the mold cavity, a porous plug adapted to be insertedin said recess from the inner side of the cope and to be seated in saidrecess, and common means extending through said porous plug for securingit in the recess and for securing in the cavity the parts to be embeddedin the casting.

9. A mold for casting a brake shoe, and comprising a drag and a copehaving a mold cavity therein, said cope having a recess thereincommunicating With the mold cavt ity, a porous plug adapted to beinserted in said recess from the inner side of the cope and to be seatedin said recess, said porous plug having a recess therein adapted toreceive a relatively non-porous core for forming the opening in theattaching lug of the shoe, and common means extending through saidporous plug for securing it in said recess in the cope and for securingin said recess in the porous plug a part to be embedded in the shoecastin 10. A mold for casting a brake shoe, and comprising a drag and acope having a mold cavity therein, said cope having a recess thereincommunicating with the mold cavity, a porous `plug adapted to beinserted in said recess from the inner side of the cope and to be seatedin said recess, said porous plug having a recess therein adapted toreceive a relatively non-porous core for forming the opening in theattaching lug of the shoe, and means extending through said porous plugfor securing in place the parts to be embedded in the shoe casting.

11. A mold for casting -abrake shoe, and comprising a drag and a copehaving a mold cavity therein, said cope having a recess thereincommunicating with the mold cavity and having an opening communicatingwith said recess, a porous plug adapted to be inserted in said recessfrom the inner side of the cope and to be seated in said recess, saidporous plug having a recess therein adapted to receive a core forforming the opening in the attaching lug of the shoe and common meansextending through said plug for securing it in said recess in the cope,for securing said core in the recess in the plug and for securing in thecavity the parts to be embedded in the shoe casting.

12. A permanent mold for making castings, and comprising a drag and a coe having a mold cavity therein, saidcope aving a tapered recesscommunicating with the mold cavity and an opening extendin from saidrecess tothe top of the cope, an a tapered porous plug adapted to beinserted in said recess from the inner Side of the cope.

JAMES S. THOMPSON.

